Zumbrota Drivetrain RAA435-2117B-P Remanufactured Dana 80 Rear Axle Assembly 5.13 Ratio 2WD DRW Posi

The Zumbrota Drivetrain RAA435-2117B-P is a remanufactured complete rear axle assembly built around the heavy-duty Dana/Spicer Model 80 platform. Engineered for GM 3500HD cab and chassis wrecker applications from 1996–2002, this unit features a 5.13 gear ratio, dual rear wheel (DRW) configuration, and a factory-style Posi limited-slip differential—making it a purpose-built replacement for high-GVW commercial and wrecker duty cycles.

Dana 80 Axle Highlights:

• 11.25-inch ring gear for maximum torque capacity
• Full-floating rear axle design rated up to 11,000 lbs GAWR
• 5.13:1 gear ratio — one of only two factory ratios offered on the GM 3500HD platform, optimized for heavy towing and commercial load hauling
• Positraction (limited-slip) differential for improved traction under load
• Dual rear wheel (DRW) fitment
• 10-bolt asymmetrical differential cover with "80" cast into the housing

Zumbrota Remanufacturing Process:

• All axle tubes inspected and straightened to OEM specifications
• Housings thoroughly inspected for surface wear and cracks
• 100% inspection of all internal components including ring & pinions, internal gears, clutches, and carriers
• 100% replacement of bearings, seals, crush sleeves, pinion nuts, and shims
• Gear tooth contact patterns verified and rolling torque set using inch-pound measurements for precise setup and long-term durability
• Correct gear backlash established to ensure proper lubrication and quiet operation
• Proprietary hydro-blast and sandblasting cleaning process restores housings to OEM finish

This axle assembly is designed specifically for wrecker and commercial tow truck applications on the GM 3500HD platform, where the 5.13 ratio delivers the pulling power required for heavy loads. A core charge and return is required with this remanufactured unit.